ChronoRolex
Daytona
★★★★★
40mm·Auto
Omega
Chronograph Watche1957| Reference | CK 2915 |
|---|---|
| Year | 1957 |
| Case Diameter | 39mm |
| Water Resistance | 60m |
| Movement | Manual |
| Caliber | 321 |
| Case Material | Stainless steel |
| Bezel | Stainless steel |
| Crystal | Acrylic |
| COSC | No |
The CK 2915 is the first Speedmaster — launched in 1957 with the legendary Caliber 321 column-wheel chronograph. Broad arrow handset, steel bezel with tachymeter scale. Three sub-variants exist (2915-1, -2, -3) all produced through 1959. The DNA reference for every Speedmaster that followed.